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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities |  |
Net loss | $ (17,453) | $ (23,039)
Adjustments to reconcile net loss to net cash used in operating activities |  |
Depreciation and amortization | 722 | 1,013
Change in allowance for doubtful accounts | (5) | (36)
Stock-based compensation | 2,312 | 1,438
Change in fair value of redeemable convertible preferred stock warrants | 826 | (166)
Loss on write-off of property and equipment | 52 | 214
Write-off of debt discount | 0 | 650
Amortization of debt discount | 259 | 285
Write-off of public offering costs | 0 | 1,292
Forgiveness of notes receivable | 0 | 437
Short-term investments accretion | (209) | 0
Changes in operating assets and liabilities |  |
Accounts receivable | (1,023) | (1,313)
Inventory | (759) | (980)
Prepaid expenses and other assets | (752) | 72
Accounts payable | 251 | 811
Accrued liabilities and other | 1,260 | 1,792
Net cash used in operating activities | (14,519) | (17,530)
Cash flows from investing activities |  |
Purchase of property and equipment | (942) | (478)
Purchase of short-term investments | (96,883) | 0
Net cash used in investing activities | (97,825) | (478)
Cash flows from financing activities |  |
Proceeds from initial public offering, net of underwriting discounts and commissions | 115,506 | 0
Proceeds from the exercise of common stock options, net | 1,614 | 383
Repurchase of common stock | (73) | 0
Repayment of stockholders’ notes receivable | 0 | 84
Repayment of debt financing | 0 | (1,119)
Extinguishment of debt financing | 0 | (29,081)
Proceeds from debt financing | 0 | 40,000
Payment of debt issuance costs | 0 | (1,540)
Proceeds from the issuance of redeemable convertible preferred stock, net | 0 | 5,427
Payments of public offering costs | (1,897) | (1,292)
Net cash provided by financing activities | 115,150 | 12,862
Effect of exchange rate changes on cash and cash equivalents | (94) | (346)
Net decrease in cash and cash equivalents | 2,712 | (5,492)
Cash and cash equivalents at |  |
Beginning of period | 22,408 | 27,900
End of period | 25,120 | 22,408
Supplemental disclosure of cash flow information |  |
Cash paid for interest | 5,500 | 4,514
Supplemental disclosure of non-cash information |  |
Conversion of redeemable convertible preferred stock to common stock | 118,547 | 0
Conversion of preferred stock warrants to common stock warrants | 1,248 | 0
Vesting of early exercised stock options | 139 | 122
Purchases of property and equipment included in accounts payable and accrued liabilities | 82 | 97
Public offering costs included in accounts payable and accrued liabilities | $ 7 | $ 0

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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from issuance of preferred stock that is classified as callable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a loan, supported by a promissory note, granted to related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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